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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823c4399d5b82327e3075479baa6e8b624f6e760146f8667522634abd70bfe1f' 
  AND token = 'WDEFY64YNJpkX4t4U0tPG/7/25uh/NLxsv4fuEdvNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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