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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe2a8e8c859f8ce2f4d27f9c9cce4cd76c6faa8dff1866d911424c49bed96c2' 
  AND token = '+B12hqBM8XyFegMbd2lVr5zJwnhRSBm1Stq0lMG2gTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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