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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f7924d61837b514a65e391c19c1fdc084b08deb24378d0154b39b0fc3e6077' 
  AND token = 'SEPwkkc1SsxvW29le+VeJTEfAmQ5niLk9IMh/qGZGlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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