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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab24d40ecefa5d5e6c9aa91617abb7c8033b1eccd7d11b29b96db2fa3ae062' 
  AND token = 'bmUR6jQVsAAMtWA755Qf8lEtQ1HN43WlD8SWV+Siukg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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