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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75eaf570d3172611571c500b9ac203cb036cb3146ce8685d2690f4286533806f' 
  AND token = 'W2pPOlqwrke8vFbZKdM3wTqGew+N7m4ZZ6kpZBNz2J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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