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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c83b01689af48c114ada35002b73b9e147fac5164065f35d87dad757a3aad89' 
  AND token = 'Rm5m9PA4uwuqREGzWv9psq14SPPDl+uGYATZb7nA4QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00508

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}