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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0990775b3e61269370926b9bcd9ba294c61aaf8b67695effa04b9bb90e870702' 
  AND token = 'oPcy0KLtmIHmWvk5IxfFt/Il/DyHvdGwfkbeGw8U9rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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