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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78ffad0eff3ce7c8d03795e372cd80c56ddf339dd2971b5a81e6d67a8327ba7' 
  AND token = 'AGK4B5a2Ps1FcRMoYTd9BXC04PRALLdfjz0OrnAJicg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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