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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d8f4cb31fbc8bed57c9fcba6404829003a7fccacdb390479feb8c826fd94e0' 
  AND token = 'Tt2l1JY+Y5dkPG+MX+n6QYTI9mRqakH/KC+fN3vcAfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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