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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6e9fe9ed3ef293d83e087d8297453454794a844e3d5223c7c06035994c1004' 
  AND token = 'SNb7RJ7tRWxjB1SXnZVTqRU2XDMoJ8rO7FJvGzPhFjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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