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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e7da491072d271f5613edeb8a4b4ff5c38d40e6bc5b4d5eb6cc34a8864978a' 
  AND token = 'v/umved4TOl5hRsHgqbZ9g1qfufxaqPEHmDLa/QLTtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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