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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c6ddf87cdc47c434b1b3a2aa24eed515b22298b46784e99c721f9e4fb56a97' 
  AND token = '/wmxguH6PewX2PAB/532ILr9M9f9mAD5X1lwBEFLVbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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