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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0593372d61126a7cee8e16b3348a0ebd19caee86059fcf9939652ada133258c' 
  AND token = '91lxCXxmJZh/nGQqyy8/rTtgeKL+uGsDkFcJ/lnMQQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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