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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50850a9fda5e7a5773ec04ed76021a194741d7df353bf141f93e4a7080cfe8e6' 
  AND token = 'Vb3cYDaEA3AQ8RzsSQ5jxgzujK8yot3nUKJlbZc6LgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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