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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe573e56c19e0e11aeeffe7c18f26e65d76be2d12faf961c5f67ce89d9f87cc' 
  AND token = 'wdMPRdGfJNB0Z9/9/G7/fgwRA6iSjfKOCky5SgRJe5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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