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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa2e3ed06a8aa27f1699652cfb17c6c33e12ea5a691fb65bdf62c6cc311dfde' 
  AND token = 'Tzobmq5Hb0ye81iRR/rFOQ4UYs7Ogm/K163UflQkCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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