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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd6f839ba9b86c56050cb9ce7e3161b9b8399f825d990456ffe71c716d67baa' 
  AND token = 'BvHjSXdcBPy+L8ONhdTXtLGCE9oiTu9So+CN8h0avh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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