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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bcd7f1419133f3654087c69e4f494a83fc4594a09b763987d3affddf516cc9' 
  AND token = 'waeT4hKYs6M3tZ51xyT1kHDc6oz+FmQ39duno/Hqye8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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