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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da2e3965ab588385d51270b9b980fb50debeaaa657e91e7ea09d49757a3769f' 
  AND token = '/03sjsRaNmhjkSivhPZuulzChp1Ak4HaFw7Lbb094YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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