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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46df029190c619d23ee68f6f5ae616e2517c923d6de1808c519f6619565a1958' 
  AND token = 'bfQn/tbZNbwCHgU2FNcPtI4+r6i43ZEpgBm3ANGlD4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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