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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec8bc96de296c3b367e14f6aabd3cd532504543c688d47a78c5a31fc13f7d84' 
  AND token = 'LX3tKkxfu65co/YWjsJ8PX1oU0Nkh60zYzvJi673T4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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