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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ddaa9da67af8a8dd182a7f269bc975af9dec23e727c10b009949116312a9b9' 
  AND token = '7Ng5l4QrlufAgtt2rVge+a0mppsfFKAE2geHZag2Y4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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