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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3ce7b0df710912a508ae9d73ab449a8d0083b747314b616f1aa57d769d99b7' 
  AND token = 'kjtxp6gAxVNbkD9OVDXIGiHTnH3csP7xOxIee7rbgA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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