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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9474962e23dd4fe3b6ed3720a886a8a8b9bdba3ce7cab4a6056299add10e81' 
  AND token = 'J0U8ANa4njaqEbXg6EUcOdWy3AUXY+YkG0cOwxbHQeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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