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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593f0cee1b1fecf2a2412f2b357743d1881f65193e3e7ce27614e5c0bc1b24de' 
  AND token = 'fEYw9wzwM9NzMkBiMNXIdv/4k/P50AOz7nqiTpIlGUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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