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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd5ec2f96581d738cb5871c955a60233151bc3616c9f15b1ccc8782a9eabcd4' 
  AND token = 'zLlTCxR9gxfhwAS3hGxgh1ZjXRjykj+Puorg3Tu/5MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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