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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fa42475cbdc53d6764afd59495e1c35f12193ba4e54cb77749c275e6256270' 
  AND token = 'hQtOBYwy9dVC61xgu9UBRoRGWMB1IwZTbHFkv35XnmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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