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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a941d441970258abe1193dbfa0d7565c0d3a3a109e9399ff12ec0b50ab470a' 
  AND token = 'bwca11vrd4vUKr0O8Ix5j34T7I0vk62U9ooF7JMdopc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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