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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09064eaa32d51bc8e3411f0eb2eb0ebc77e608e51074976f911c5ea76bed67cb' 
  AND token = 'ak21Mh9ZU44BVsGNjun+YaGHHi3+WoAzYofPbacJTrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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