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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ad657100d2ff886b4921bdea09284a954efa4559738ff7dc6917cc5c529ad8' 
  AND token = 'RnR8lqCfFccA5unD+zNqNWzAkfB01xMZ7Z1sx8cR8gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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