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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29da54c9ab92a47aaeb112c65a4a468308125cf00abafb33d9997155cb56dc19' 
  AND token = '2eB/sG9TYHIQb7qfgBiNGVTDMB5X6lB50tQqzGYN8zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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