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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9217e0340d0048bff232530ae1b557335aca19a8e5b2ac004f253ed38c135c3' 
  AND token = 'W2eswVwtdMEgPa4vXPma1hpN8JSq5GpxNs4QDScvZSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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