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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03f68b467d70d38e6cae620929e51dd6eed051a9ff86c3295d4058a8745bed8' 
  AND token = 'NDQ0VD7EzTeTHYAhoL8Q3F1fl1Jh8M2BIm3HobL01lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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