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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef695f4b6de75b9684e03b443059f2103a0f12c2bba32be51da0fd3b079ff52' 
  AND token = '9v2DoaLp/S4ep2wP8J8LSwKVa5AVaexNijaC9gxmnYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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