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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba35491bfb1b4027c6e625f50e85f7b92d981768a8728ad8a46231f16ba3978' 
  AND token = 'Z173aLGirxeC91ElPcFNFq4gslqiwHfL2oK2l6FNT9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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