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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f10030ea5b22ada662ceeea859e208013e3987120c081d045fd43610b8c134' 
  AND token = 'wLLbFgLx8OLmb5l9xAifgFOxB3IWZAlACLm+WD2xEHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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