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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b38c71c656ba2e83d8cb5944a76e98703a761588f06527ecc166c91cdc6666' 
  AND token = '99XvUUWlQkab2JLrlSnpgYFDNkVnKvdKMBM6/ujRuxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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