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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fd5c7ba2237d38f7b32959e4e8901091108c41f1669113111c0ef915b6b8a5' 
  AND token = 'rDsQy14/hgHt085tKtMJVAoDNc/CAK/DF/aMRkxDVos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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