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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35e279153b083087d7c5e64e941ff30c201cf014098855b08ae94ba1c5f2845' 
  AND token = 'ig/+glYy2TzBAp1LLyC9wRyI2TvM5ES1wiIZTp1BaZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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