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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85446f53132ff7f7cf059ea08e65092fa3c2c4f7104503e079544e1c526b582' 
  AND token = '2doZj9Hnms+smnBgzCrk9Q3RvJexkTqD1r70ahfWbY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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