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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a74bd7725867ad1b12661a9d88ed239acf5683eeaaea62cefc71ae14c4eedc2' 
  AND token = '0j3XNVLTSL+Z+yeWcWlsJHwhengAjoP3Mz4lMfLHgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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