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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c4749e2f4516dec4c8e5ed644d5d7498c9f5652dc8b0b74f45ce2e9adec2a6' 
  AND token = 'sK0ciXYV7yTIcM3MaJutIGs1uvJeSOkc5Vr33wr9umg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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