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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4626772149926b24c9172aa55990047edd78585e7954f6e94cd574663c85d12' 
  AND token = 'sFeKMR1ETg67YXWTLCSGmk3UiFt4kloJSJ9SWprfE/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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