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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87e31f173d10ad3b39876ddaa8d07971f0d3fdda0b7c6b17db7280b4a2c2b40' 
  AND token = 'WqhzJ419oISEwWAigrBroYB/dVdddT0vOQ3YaJKQS30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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