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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df47bb8d3a8c8ca0828cd582e60083294a01a909acd68a8e33e1a44a71711aa' 
  AND token = 'mR9AKMdO/vCaJrvwYZ1gE0n6y/43E5zX6JzFZDD1tDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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