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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95165f88f1446674a9b3033f8c6d08d89365ca73f24e043b9673fc9d24baec65' 
  AND token = 'Zx3NkmEYtx/UPQFlehMhiq9p6/c74zDdnAUP5G0zd9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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