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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb2aa09e1d82f29c6f1c04bec1a76f7ff7116a860cd9614611f016b343b4ea7' 
  AND token = 'Ukpet1htdWDS2bN+CVQSPTwgcz+391cGBSvegsVeMMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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