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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc316ee5e893441c7b00edb781f72120e5a48de78445ba93d05501a2843fd9b' 
  AND token = 'hwzSbqsfPHUWy6W4VIz86OEsh6omWq0e3tjE61a6vpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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