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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb3ba830c459cc94a038d8bc19d39144a5ebada26f56cbb60a8b88ce09098fa' 
  AND token = 'kcpEDt36HT+Thr+L0AoizZmiz89oRKL7W/+gtFfmuDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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