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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd891b89ecff5f55c8a8ed6490ab62eb5485c8d3f0c307f7d62574c76990cbb93' 
  AND token = 'YhKmp5pJotIe/GgxHNLZJmcqdRW6KREQSgi1425W6lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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