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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cfc79bf5a4042addff649466a32336f6e76ebea5c73ee069bf3ff39eced49e' 
  AND token = 'nUPNAyuw1C6F205fvYb1b3FglgvsttVO2WSpGJTyO/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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