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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea4734bdacf1e0198bddec3ba7d317b07b45f6675df6d38c5793a5b8f4de228' 
  AND token = 'I6kgF6gKv4ptLhutgFsKQKMC4P+Jk7oLsRvLJDk8s+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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