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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a7bf8e102e7b0f316bb33e3fd11d97a114f2b73a07748f637b3cf1d1a34f5e' 
  AND token = 'pTDnw2osa1iYQW9iAIdwGkyF0VuDMgTeTFbl/zj6Nuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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