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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cd99a3fcfdfebd00f1dca6b6ba4b81d343694ee98cc21a214733fea3ad754e' 
  AND token = '6NciFIJ6bKRW2g5xdg+PvF1kBSYeVrLNprM3AtU574E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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