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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec155f35dca4c6965fb3afc235c1d726f247f7198f3d943841a8de66f8d12501' 
  AND token = 'l0dUSPJYfkk0jq8EE+gaU5bRpvvEdHflqr7nMLjD1WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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