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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce7ef588c4021a6dbab1101c6abe6126c4e26404b77a5b756c5945e7c63f68e' 
  AND token = 'xcZk3AP9eV9Mw3sCRv+J70jYFQJVY/NanFq1JbHxMKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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