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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113dfdc11c8a6dd93ef42e58059540efbabadc35cbabf5e6d6295acbc6383be3' 
  AND token = 'cBwECeTAr2tPo17nDoCQqbNZqGRJFh8594erguMdGME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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