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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dc691e9bec731132b348e146ed7aacea0b676bda3a50ee1022abac56c11c70' 
  AND token = 'nZB3YwyRa8upQNmKmz2K9GOPUWS4jZaOT4vstOcT704=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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