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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb50d692da21d2e986d59aaff84dfc69e67c6f6bff6f8c9e4d6662660d7f9de' 
  AND token = 'SHPKZ+ki6kHq7uMYcs9RXqacbSCHIjZ0gmMD0bl93Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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