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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0a07b39a13d22e5705fe2eb9ebe0d323de9d68653dea27e8602b5fc6d8fd59' 
  AND token = '3ik527VYG++qAimc9yTPRqQrnI2ocZQYX1FWBy+gGyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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