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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b896fe4a6fa1c8affbf792c95e1e81c8cf545d809aab73f0b471b7e188cf7715' 
  AND token = 'qkhEF7IXdpBrxpO9VbLwmDGVnXF08cn1sHha3aUBFfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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