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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034e98c69ecd6d99d027c395692f606af198e8f775cd69eb9df4d0ce14efcdc4' 
  AND token = 'ciRfzsM1l3qd5K726/Y4Ocb7uP1B0PV0XihqCn7iTS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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