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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2513882a91914e0abd4b8d7d35ac73267957505fcc9131a78873fe00dfea9a5e' 
  AND token = 'bUw77MWHx1RDoekPb8qumENlFT53JNCwATlDVk7FIKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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