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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b25e5426b109be2c6a5e9b4bf9a399ba94801f942b8726c626f92806a3809e9' 
  AND token = 'd5A2iZpGvftG2zIlE2HZIPdZzLu42O/CMCtsC2WjU7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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