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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56db0f913d01b03f17544cabb32932d874e704aa3f574bc9bd73ed3d7ca88c53' 
  AND token = 'qvUOSbS9gmY3UC5oJeYKhFdA4eVFQaPIy8xnqxNLmKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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