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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa3b7a838e518bd89ee8116a7de66cc7832fea04628b6e0b3740fb188a28824' 
  AND token = 'OlvSq5bjzk6ZETx+s8Bgrc43xgFJLje8D4/Z3Z0fFlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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