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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c9a677d6c059055734af1dc925a40e9a1e1a2e3c56059e99d4b91db9132928' 
  AND token = 'RLrpepiOTazy75P9r2FZ/3u2HsquaNtHN/uO5K2Y89s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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