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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5f367f0f0096eaef20f7305fc5c08fa152acabef573120ead781fd544e1352' 
  AND token = 'G1mHe77a9sB4Ab+jSmnMMYM4J77bFj6LPQu5otTkMjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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