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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cf86c3c0996baef30d90456dc45386b87ad3ecf7f7218dad23fb56bf094f3f' 
  AND token = 'ZTmJQcUWw7DMyubCTd8EkOapXNRirk9eyi7PC/brzIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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