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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d40e409aa310ac9cf4c98a9b15e5b8486b2b9c3384c88a15de14d3982d114c7' 
  AND token = 'Bhy/tVIogebP4XvGHRmMesNBUXpdMhh763S0m+d3vZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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