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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1d339ae20039fda1c134e4acb5a1f477b30a7aa5ef7582688c735e72e37db7' 
  AND token = '62ZBlbD09HHHvp52RfjxQITxGY9z9LLFLtuEKGjKU+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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