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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad758c03c8ded1a85dc54cfa28c8df15e6ea5413d474cdaf257d79aa100d5c41' 
  AND token = 'x2CD02jkRUWJgsb0KFefAgpllmx1Vbr6mCOjvHF1CoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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