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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82032309142f3a45fc85d9e3ef489c64f7917e0dc25a101872e31e218c5e188b' 
  AND token = 'vfv3ytYQVMKkuy39iiMkOtAW4uYIaZB6ag8Nkn/U6tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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