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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee138dbf2760b88f9cbf9baaf0ebd88233fe7ed0bd55a4a93bf6abfba9b5e9aa' 
  AND token = 'Zi4ksIDf45MpOaHojAp87M3HpgLX94qeUbZhUj+Tzhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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