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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29f1be02fd96fed5a45fc5356942076da439ee653c7789a28d2e1deb6d6efc8' 
  AND token = 'bAw+A0Boj3a+sjh1ldANdDmFKKX+nRbEaju2I0Bco6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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