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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caa093f5ca5edcca865b18d962cb82a5ee85b34f4c02aa0d74bd40890d3dc9c' 
  AND token = 'dJfnZTtLXeG8q85eyNGtnTaMd+K5aBFmzaWtN+aPDGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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