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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4baab3a7af9add3e2e518ae30458e08cc0e1d4fea594c5488c5b47f67d3bec21' 
  AND token = 'erZ17eBA+aptn2ozQFZD8smjjzLNL1Vi/xr5RtbXC40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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