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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87506154be5768812e5ec3c75018dd4e5c91ce51366302adb495e981f3e31835' 
  AND token = '90/H2fe2qrXF9j5Ivad/wX8ANH3LaXKk3liih0mribU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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