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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7669cabea980a8e0af75cfc7a5eca2eadf89249bcbf06f10d375823e8fa681e9' 
  AND token = 'Z+PdJEBmB60d1Nl/bbZ1es7RuDIqj3/3oXZeyPw78gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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