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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4de18d8ae11ac9769a0a8949656ff2fc6360cdbdc9d627b2eee00898395aa8' 
  AND token = 'ih1tOm55dJhJoPYv6aQpTqbPbVia6ekLcHmJ5fYwHIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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