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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dffed8634eac7f3da83249d680cf2c15d262c8fc78c5698d2a8d0937df77c9' 
  AND token = 'rlfieQJJ5Nqyhc3N6MkUE+DWbFnkBnjLi5VHk6NRWEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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