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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2157be5db2625edf5105fe5e546f45e8d92513d62c992f3323940b8d66e8bd' 
  AND token = 'pzuGBgT8hIG11A8DlYSkcnSxmCAJtSAePhIvjOph7Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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