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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7f0715de304cb962516cf5fc8472abb50cd6fa1c2b911428e9d0291c3d7f74' 
  AND token = '809klHPjlSOh7Y/dAyB3VdiIi+WDO7x3bFtcOlUHk0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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