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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ce342c3c983b8fb96cf4bd5b611dc329d4216de231087bad824327bd384880' 
  AND token = 'gfaiTRdstkarYGhuAA6RjjiJKAEHw04OdTNjTfMvU/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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