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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5bf548ce91db087aa2171bb16295a710761262ccf9750a1049e8f83b39b0b3' 
  AND token = 'tAWJjK861U4c7hgRUH5h7EN9x3GBKXuIUwj1tvBJ5eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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