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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a0d822610d343d01d56d8db2e8003a25ddf7d7b0a0ad1964c43c4f23675363' 
  AND token = '6TgS/yHxk6HJEra90XzvC5sOspivbvB14yTzecaepU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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