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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c71899c384e66f3cf0dc8e4dea745a1a95ae6e25cc8a49b28149f8300c885f' 
  AND token = 'V/tDDbKKnunu0ppCnjBgaCdh3NovJzBEXkf2sBlOeMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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