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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562bfde7219d73cecaba5fa34536cfde3819f8472d2550ff3cf7f4338e1760a3' 
  AND token = 'mpNKStRVQYFpCLFhu+hd2aVm88VokLViv1d6M2icmF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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