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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9e0347a0419b56a0b5b65a69f011503c9ef747bb3a6351eab65c25e4c56ff2' 
  AND token = 'kvqM9z88O8AZ/rJs6TxqayK2JNPup+N2fAA9BkwvDaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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